As with capital goods (tangible items such as buildings, machinery, and equipment produced and used in the production of other goods and services), the consumption of a durable good is spread over its life span, which tends to create demand for a series of maintenance services.
The event which is referred to as The Phoenix Lights comprised of a series of incidents, involving a number of different craft and orbs which took place during the evening of March 13th 1997.
Most of the controversy that arose from the incident centers around a cluster of lights that was seen, and videotaped, to the south of Phoenix at between 9:30 and 10:00 p.m. on the same night as the sightings.